Eric, With due respects, there is a flaw in your thinking. Many ISPs give users NATed adresses, without users really knowing or understanding what they are. When the users try applications or serves which fail because of the non-transparency, the users may not know the cause of the failures. I had some VPN software that fails due to NATs in hotels, for example. Support people told me that the hotel used NATs for security - I sent a log showing all of the probes my macine had from inside the network. My main point is that users & providers are often confused about NATs. John > What applications that people want to run--and the IT managers would > want to enable--are actually inhibited by NAT? It seems to me that > most of the applications inconvenienced by NAT are ones that IT > managers would want to screen off anyway.